Does liquid gypsum change soil pH?
Does liquid gypsum change soil pH?
By Joe, Founder of Dr Forest · June 2026
Does liquid gypsum change soil pH?
No. Unlike lime, gypsum is close to pH-neutral, so it supplies calcium without making soil more alkaline. That is useful when you want calcium on a soil that is already at the right pH, or where you do not want to raise it. If your aim is to correct acidity, use lime, not gypsum.
The reason is simple chemistry. Lime raises pH because its carbonate neutralises acidity in the soil. The sulphate that gypsum carries alongside calcium does not do that, so the pH stays where it is. This cuts both ways. Gypsum will not sweeten an acid soil, and it will not sour an alkaline one, so it is no use for acid-loving plants such as rhododendrons and blueberries if you are hoping to lower pH. If you do need to move your pH up or down, our guide to raising and lowering soil pH covers the right materials for the job.
From the Dr Forest range
Liquid Gypsum: micronised calcium and sulphur
19.55% calcium and 15.31% sulphur, milled to 5 microns and handcrafted in Stockport. A calcium and sulphur feed that does not change soil pH.
See rates and sizes★★★★★ 5-star across all platforms · 3,250 reviews · See the Liquid Gypsum page.